Multiple Choice Questions (MCQ) on Electrical Machine Design for Electrical Engineering
1. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors?
(a) Copper
(b) Aluminium
(c) Steel
(d) Cast-iron
Ans: d
2. The density of hydrogen is _____ times the density of air.
(a) 0.07
(b) 1.5
(c) 2.5
(d) 3.5
Ans: a
3. The thermal conductivity of hydrogen is ______ times that of air
(a) 2
(b) 3
(c) 5
(d) 7
Ans: d
4. The resistivity of water should not be less than
(a) 10 Ohm m
(b) 100 Ohm m
(c) 1000 Ohm m
(d) 2000 Ohm m
Ans: d
5. ......... are always double layer type.
(a) Closed windings
(b) Open windings
(c) Either of the above
(d) None of the above
Ans: a
6. The winding where dummy coils are used is sometimes called
(a) duplex winding
(b) triplex winding
(c) forced winding
(d) none of the above
Ans: c
7. Dummy coil should not be used in
(a) small machines
(b) large machines
(c) either (a) or (b)
(d) none of the above
Ans: b
8. Power transformers have rating
(a) equal to 50 kVA
(b) equal to 100 kVA
(c) above 200 kVA
(d) none of the above
Ans: c
9. Power transformers should be designed to have maximum efficiency
(a) at one-fourth load
(b) at one-half load
(c) at or near full load
(d) any of the above
Ans: c
10. In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
(a) 5 percent
(b) 10 percent
(c) 15 percent
(d) 30 percent
(e) none of the above
Ans: c
11. Yokes with rectangular cross-section are used for
(a) small capacity transformers
(b) medium capacity transformers
(c) large capacity transformers
(d) any of the above
Ans: a
12. Cylindrical windings using circular conductors, employed in transformers, are
(a) single layered
(b) double layered
(c) multi-layered
(d) none of the above
Ans: c
13. Helical windings are used in
(a) distribution transformers
(b) power transformers
(c) shell type transformers
(d) none of the above
Ans: b
14. Multi-layer helical windings are commonly used in the transformers as high voltage windings
(a) up to 20 kV
(b) up to 50 kV
(c) up to 80 kV
(d) for 110 kV and above
Ans: d
15. Disc windings are primarily used in
(a) short capacity transformers
(b) medium capacity transformers
(c) high capacity transformers
(d) any of the above
Ans: c
16. Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling (a) 2 MVA
(b) 5 MVA
(c) 7.5 MVA
(d) 10 MVA
Ans: d
17. The flash point of transformer oil should be higher than
(a) 40°C
(b) 60°C
(c) 80°C
(d) 104°C
Ans: d
18. D.C.servo motors are used in
(a) purely D.C. control systems
(b) purely AC. control systems
(c) both D.C. and AC. control systems
(d) none of the above
Ans: a
19. The stator of a D.C. machine comprises of
(a) main poles
(b) interpoles
(c) frame
(d) all of the above
Ans: d
20. In a D.C. machine, the number of brush arms is _____ the number of poles.
(a) less than
(b) equal to
(c) greater than
(d) none of the above
Ans: b
21. In D.C. machines the number of slots per pole usually lies
(a) between 2 to 4
(b) between 6 to 8
(c) between 9 to 16
(d) between 20 to 30
Ans: c
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